# CatAche Diary vs SymptomLog

The clearest difference is ads: CatAche Diary at none against SymptomLog's shown. CatAche Diary also leads on iOS requirement (13.0 vs 17.6). SymptomLog's advantage is update cadence (every 2 days vs every 4 days). On price, in-app purchases and device support there is nothing between them.

Both are free to download. CatAche Diary sells 1 one-off in-app purchase and SymptomLog sells 3 in-app purchases, starting at $2.99 per month. Whichever you choose, the download price is not the number that matters.

CatAche Diary ships an update every 4 days, SymptomLog every 2 days. The most recent releases landed on October 24, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | CatAche Diary | SymptomLog |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 4 days | **Every 2 days** |
| Size | 27 MB | 17 MB |
| Requires iOS | **13.0** | 17.6 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Stefanus van de Wetering](https://appshunter.io/developer/1883002799) | [Sajith Lal m k](https://appshunter.io/developer/1680857165) |

## What reviewers say

### CatAche Diary

[App page](https://appshunter.io/ios/app/catache-diary-headache-log/id6760231940)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Upgrade | $1.99 | one-time |


### SymptomLog

[App page](https://appshunter.io/ios/app/symptomlog-illness-diary/id6774916416)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| SymptomLog Monthly | $2.99 | per month |
| SymptomLog Annual | $14.99 | per year |
| SymptomLog Lifetime | $24.99 | one-time |


## Frequently asked questions

### Is CatAche Diary free?

CatAche Diary is free to download, with in-app purchases available.

### Is SymptomLog free?

SymptomLog is free to download, with in-app purchases available.

### Do CatAche Diary or SymptomLog have ads?

SymptomLog shows ads; CatAche Diary does not.

### Which is updated more often, CatAche Diary or SymptomLog?

CatAche Diary ships an update every 4 days, and SymptomLog every 2 days. Most recently, CatAche Diary was updated on October 24, 2026 and SymptomLog on October 28, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*